Aberation angles of comet Bradfield 1987 XXIX plasma tail

D. Kubacek(1), E. M. Pittich (1), J. Zvolankova (1), J. Ticha (2) and M.Tichy (2)
(1) Astronomical Institute of the Slovak Academy of Sciences
Dubravska cesta 9, 842 28 Bratislava, The Slovak Republic
(2) Klet' Observatory, Zatkovo nabrezi 4,
CZ-370 01 Ceske Budejovice, Czech Republic

Abstract. A set of thirteen large-scale exposures of comet Bradfield 1987 XXIX taken between 1987 November 8 and December 25 is evaluated. The observations were obtained with the 63/85/187 cm Maksutov telescope of the Klet' Observatory. The studies plasma tail with visible plasma rays, kinks, and disconnections events on some exposures extends out of the field of the plates. Therefore, the tail must have been longer than 1.75 degree. The dust antitail on the best exposures is as long as 0.5 degree. For this period the solar wind velocity is determined from the aberration angle of the plasma tail in the comet's environment. The determined value of the solar wind velocity is compared with the satellite data recorded near the Earth.

Contrib. Astron. Obs. Skalnate Pleso 25 (1995), 83-89
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